Variable-pressure intensifier.



P. STEINMANN.

VARIABLE PRESSURE INTBNSIFIER.

APPLIOATION FILED AUG. 21, 1912.

1,084,715, Patented .1311.20, 1914.

"wl-YL Z da U\"\\ FRITZ STEINMANN, OF NIEDERSCHNEWEIDE, NEAR BERLIN,GERMANY.

VARIABLE-PRESSURE INTENSIFIER.

Specification of Letters Patent.

Patented J an. 20, 1914.

Application led August 21, 1912. Serial No. 716,121.

To all lwhom. z't 'may concern.'

Be it known that I, FRITZ STmNi/IaNN, a subject of the King of Prussia,residing at Nicderschneweide, near Berlin, in .the Kingdom of 'Prussiaand German Empire, have invented certain new and useful Improvements inVariable-Pressure 'Intensifiers, of which the following is a specification.

My invention relates to umps for. the supply of water or other iui undervar1able pressure, wherein the variation of pressure is obtained bypistons of different areas.

The novel features of my invention reside in the provision of a pistonhaving working surfaces of different areas acting to suck 1n water orother liquids during the return stroke of the piston, and to supply,during the forward stroke, first the liqul at a lower pressure andsubsequently at an increased pressure, the degree of pressure dependingon one or the other of two positions of a shut-ot-valve arranged in'advance of thel discharge pipe, such positions causing either the largerarea of t-he piston alone, or both the larger and the smaller area ofthe same together to act in discharging the liquid into the exhaustpipe. The said valve may be operated manually or automatically.

My invention is shown in the accompany- ,ing drawings wherein- Figure 1is a vertical section through my new pump, with the valve arranged forautomatic operation, and Fig. 2 is a sectional view of the valve shownin Fig. 1, but in the other end position.

The improved pump, according to this invention, consists of alow-pressure cylinder a, within which works a piston b, the rod c ofwhich carries at its upper end a piston d forming with the portion c ofthe rod a kind of a stepped piston having two different'active areas.The said piston d reciprocates `within a. high-pressure cylinder e, theupper end of which is formed as a valve casing e containing a valve f.The valve casing is connected by a supply-pipe l with any suitablefeed-water tank or su ply, not shownl in the drawings, and a ischargepressure-pipe m connected with the valve casing leads to the hydraulicengine.

If the valve f occupies the position shown in Fig. 2 and the piston b isforced upward by means of the liquid, it is obvious that the highestdegree of pressure will be obtained, because, only the small area of theportion o of the piston rod is made operative and the pressure liquidabove the piston d not only is made to deliver its working effectdirectly into the hydraulic engine, but also, through a side conduit g,below the piston d. In this case though but a small quantity of waterunder pressure will be made operative, the pressure obtained isconsiderable. If, now, the valve f is moved to the position shown inFig. l, the full area of the piston d is made operative for producingthe pressure and the whole quantity of water under pressure resultingtherefrom is ^forced only through pipe m into the hydraulic engine, noWater being forced through conduit g. During this part of the operation,the differential area of the piston d will cause suction of feed-water'of low pressure through the conduit g, and a large volume of water of acomparatively low degree of pressure will thus be supplied.

The valve f, is arranged to be automatically shifted from one to theother. position during the working stroke of piston b. To this end thevalve f on one side is placed under the action of a spring 7L, while, onthe opposite side of said valve its casing is constructed to form ahydraulic cylinder i. Owing to a connecting passage 7c provided in thevalve casing the liquid pressure entering the hydraulic press may passinto said cylinder fi. The operation, in this case, is as follows :-Onstarting the valve f will occupy the position shown in Fig, 1, wherein,initially, the piston d will roduce liquid pressure, while thedifference 1n areas of the two surfaces d and c serves to draw in thefeed-water by suction from the supply-tank. Now, as soon as the liquidunder pressure within the hydraulic press rises to a predeterminedlevel, which may be varied as desired, it passes through the passage kinto the cylinder z', thereby actuatin the valve f and shifting the sameto t e position shown in Fig. 2. Now, for generating liquid pressure,only the area. c of the piston d will be operative, since the liquidpressure will but little power is being consumed by the press, theresistance being low, the amount of liquid required to provide suchpressure will be comparatively large, and at the same rate as theresistance increases, the supply of the liquid medium for generating thepressure equally decreases.

What I claim is 1. Variable liquid pressure pum comprising a lowpressure piston, a di erential auxiliary piston, an inlet port for thelow pressure operating fluid, a discharge port -for the fluid under highpressure, an automatic valve interposed between 'the said auxiliarypiston and the said two ports and al conduit for leading, the fluid tothe rear of said auxiliary piston, said conduit being adapted tocommunicate either with the said inlet port or said discharge port,according to the position of the said automatic Valve.

2f Variable liquid pressure pump, comprising a low pressurepiston, adilerential auxiliary piston, an inlet port forvthe low pressureoperating fluid, a discharge port for the fluid underhigh pressure, anautomatic valve inter osed between the said auxiliary piston an the saidtwo ports and a conduit for leading the iluid to the rear of saidauxiliary piston, said conduit being adapted, to communicate either withthe said inlet port or said discharge port, according to the position ofthe said "automatic valve,

and a spring acting on one side ofI said valve and a hydraulicallyoperated member acting on the other side of that Valve.

In testimony whereof I have affixed my signature in presence of twowitnesses.

BERNHARD Gmnfrz, RICHARD CRUOK.

